Manufacture of rollers for roller bearings



May 6 1924.

' K. O. LEON MANUFACTURE OF ROLLERS FOR ROLLER BEARINGS 5 Sheets-Sheet l I5 Sheets-Shet 2 am 2 Q 91/14:: v 5% y K. o. LEON Filed April 21. 1925 l A Z M MANUFACTURE OF ROLLERS FOR ROLLER BEARINGS May 1924.

May 6 1924,

K. o.- LEON MANUFACTURE OF ROLLERS FOR ROLLER BEARINGS Filed April 21. 1923 3 Sheets-Sheet 5 Patented May 6, 1924.

UNITED STATES KARL OSKAR LEON, OF LONDON, ENGLAND.

MANUFACTURE OF ROLLERS FQR ROLLER BEARINGS.

Application flled.Apri1 21, 1928. Serial No. 838,710.

To all whom it may concern:

Be it known that I, KARL OSKAR LEON, a subject of the King of Sweden, and residing at 115 Great Portland Street, London, W. 1, England, have invented certain new and useful Improvements in and Relating to the Manufacture of Rollers for Roller Bearings, of which the following is a specification.

This invention relates to the manufacture of rollers for roller bearings and more particularly to that kind known as disc rollers.

One of the objects of the present invention is to provide an improved method of grinding the rollers of roller bearings, according to which each roller is tilted to and fro between predetermined limits at the same time as it is rotated on edge in operative contact with a rotating grinding disc, so as to grind the rollers to a transversely curved periphery.

Another object of the invention is to construct a machine for carrying out the above method of grinding, and in which the rollers can be ground to the exact diameter required, and to the exact periphery required.

The invention will now be described with reference to the accompanying drawings, in which 2-- Figure 1 is a sectional elevation of one form of machine constructed according to the present invention,

Figure 2 is a similar elevation of the upper part of a modified machine and drawn to a larger scale.

Figure 3 is an irregular inverted horizontal section on the line 3-3 of Fi re 2,

Figure 4 is an enlarged detail of Figure 1, and

Figure 5 is a diagram hereinafter re ferred to.

In carrying the invention into effect, the machine comprises a fixed main frame a supported by a wall or standard. The lower half of the machine consists of a horizontally arranged circular grindstone 6 protected by a guard c, the grindstone being carried on a vertical spindled which is midway of its length, slidingly supported by a bracket e fixed to the frame a, whilst its ends are carried and supported by brackets f and g respectively. These brackets are adapted to be simultaneously moved in suitable guiding slots relatively to the fixed frame a by means of a bracket f through which is threaded an adjusting screw 7:.

supported at each end by brackets j form- 1n en of the adjusting screw it, which is 1mmovable lengthwise, is adapted to be rotated by a bevelled pinion k which is in enbracket f passes through the slot. When the handwheel m is rotated the bevelled pinions Z, k transmit this movement to the adjusting' screw h, whereby the bracket f and therefore the brackets f and g are bodily raised or lowered relatively to the central fixed bracket 6 thereby properly adjusting the height of the grin-ding disc I) as desired.

- The bracket 6 is formed by two arms which afl'ord bearings for a sleeve 6 to which there is keyed the driving pulley n which is arranged in between the two arms of the bracket 0 and the sleeve 0 is provided with a long keyway to engage with a key a part of the main frame. The up er v c, as shown, by which the driving pulley n imparts movement to the spindle d by which the grind-stone is always driven whether it is to be adjusted or otherwise.

The lower end of the spindle is carried in a suitable footstep bearing 0 as illustrated, that is contained by the bracket 9.

The upper half of the machine comprises a roller cage p which is arranged in parallel relation with and above the upper surface of the grinding disc 6, and such cage is sus pended from a spider frame (1 which is centrally and fixedly suspended from a stem 1" which is vertically arranged within and fixedly supported by a tubular bracket .9 which forms a part of a frame t which is held in suitable fixed relation with the main frame a. For the purpose of accurately adjusting the frame t suitable bearing slots may be provided, which are not shown, for attaching it to the main frame a.

There is arranged within the stem 1- a spindle u which is extended through the centre of the spider frame (7, and is fitted towards its lower end with an enlarged shoulder V, and beneath the shoulder is rigidly connected to a pin w, which as seen in Figure 1, is eccentric to the spindle u. Secured upon the enlarged shoulder V of the spindle is a spur wheel m which is in enlbs gagement with a toothed pinion y mounted cage ring 79, and a number of grinding seats 13 are spaced around the disc 12, the seats facing downwards and being constructed as hereinafter described. The eccentrically formed sleeve 10 is flanged at its lower end so as to be properly fitted within and held against the lower side of the disc 12-, it being maintained in position by means of a nut 15 which is screwed or otherwise attached to the lower end of the eccentric pin lV. By this means, the horizontal driving disc 12, the spindle u and the spur-wheel a:

are securely clamped together.

Between the enlarged shoulder V and the underside of the centre of the spider frame q a spring 16 is arranged, as clearly shown in Figure 1, and in order that the spur wheel 0:, the eccentric pin \V, boss 1l,and the disc 12 with the grinding seats attached thereto may be all bodily raised against the force of the compression spring 16. the spindle u is provided about midway of its length with a cylindrical rack 17 which is keyed to the spindle a and is accommodated within a space formed within the stem 1-. In order that the cylindrical rack may be raised or lowered, the teeth thereon are in engagement with a pinion 18 supported upon a spindle 19 and adapted to be rotated by means of a rack 20 which is adapted to be raised or lowered by means of a handwheel 21. The centre spindle of the handwheel 21 is screw-threaded as shown, and imparts an elastic pressure due to the spring 22 upon the end of the rack 20, so that when the handwheel 21 is operated in one direction or the other, the spindle u will be raised or lowered as the case may be. and thereby withdraw the horizontal disc from the position shown, or lower it for the purpose hereinafter described, the gearing between the spur wheel 00 and the pinion 1/ being always maintained.

The withdrawing movement of the horizontal disc 12 may be limited by a fixed arm 23 which extends from the fixed frame If to Within the spider frame 9, as shown.

The cage ring 72 arranged immediately above the grinding disc I) is provided with a number of slots 24: near its outer edge, each slot being adapted to receive a disc roller which is to be ground. The slots 24 are spaced as close as possible together all round the cage ring so that as many disc rollers as possible may be treated at one time. The form of each slot is such as will permit the roller to oscillate from side to side and it is preferred to tit each slot at its respective end with facing plates or discs 25, the lower plate having an opening which practically fits the width of the roller, whilst the upper disc 25lu1s an opening which corresponds with the larger end oi the tapered slot formed in the cage. ring, and which will allow for the tilting movement of the disc roller. The seats formed in the horizontal disc 12 are of special form such as clearly illustrated in a detail view Figure 1-, and are constructed as follows 1- The edge of the horizontal disc 12 at its lower side is provided with a thickened boss 26 which forms a casing to contain a replaceable annular block 27, which is maintained in position therein by a screw stud 28. On each side of the block 27 there is fitted a spring tongue 29, whilst the undersurface of the block itself has a convex face as shown clearly in Figure 4. When the machine is in running order the rotation of the spur wheel m causes a rotation of the disc 12 mounted upon the eccentric sleeve 10 and the eccentric pin l/V, thereby causing the disc 12 to have not only a. rotational movement of translation but also an oscillating movement, which causes the rollers which have to be ground to turn on their own axes as well as totilt sidewise. The grinding of the rollers is caused by adifference of speed between the horizontal disc 12 and the grinding disc 72 and as each roller disc is tilted its periphery is more and more ground to a convex form as regulated by the degree of convexity previously given to the block 27.

It is to be noted that as each roller disc tilts first to one side or to the other it will flex one of the spring tongues 29 to ensure that with the return movement of the disc 12 the disc roller shall again resume its upright position relatively to the grinding disc 6.

In order that the degree of eccentric movement given to the horizontal disc 12 may be adjusted, the eccentric sleeve 10 may be moved so that its throw may either be brought. into coincidence with the eccentric throw of the pin V, in which case the geometrical centre of the disc 12becomes fixed,

illl) or the sleeve 10 may be so adjusted that this flange on the lower end, of the eccentric sleeve carries an index 30 which is designed to register with a series of graduatlons 31, as is seen clearly in Figure 3. After the adjustment is made the nut 15 1s tightened and the machine is then ready to operate under the new adjustment. I

The diagram shown in Figure 5 Illustrates clearly the arrangement of this ad ustable eccentric, the black line32 representlng the throw due to the eccentric pin W and with the throw of the eccentric sleeve in coincidence therewith, but when the sleeve hasbeen adjusted through 180 the total throw imparted to the mechanism is indicated by the addition of the dotted length 33 and the black line 32. I

For normal grinding the weight of the parts, that is to say,'the spur wheel 41:, the horizontal disc 12 and their associated members resting upon the disc rollers exert sufficient pressure. If any extra grinding pressure is temporarily required, the upper part of the stem r is fitted with a bracket 34 which serves as a fulcrum for a lever 35 adapted to be pressed down upon the upper end of the spindle 'u, so that should any further grinding pressure be required it may be supplied.

In the drawings it is to be noted that the centre axis of the spindle u is slightly out of alignment with that of the grinding disc. Such an arrangement of the two axes will ensure a slight traversing motion over the grinding face to better distribute the grinding surface.

The second modification shown in Figure 2 is substantially the same as that already described, but the horizontal driving disc 12 is fitted with a pin 12 engaging with a slot 12 in the spider frame 1 so as to prevent rotation of the disc 12. It will however receive the oscillating movement described. In this figure instead of the handwheel 21 being horizontal it is vertically arranged and is mounted directly on the spindle 19' of the pinion 18. The seatings 13 are slightly modified. As shown in Figure 2 a series of openings 36 are bored through the edge of the horizontal disc 12 with a projecting flange 37 at the lower end. This receives and supports a set of pressure discs 38 each having a centre pin 39 which is held in position by a screw cap 40, a spring 41 being arranged above the centre pin 39 and inside the cap 40. The lower face of the pressure disc 38 rests on the top of the corresponding disc roller. To decrease friction between the parts at the centre, ball bearings 42 are provided between the centre boss 11 and the eccentric sleeve 10.

By the foregoing constructions it is possible to grind disc rollers to the form desired with reat accuracy and with speed. The mechanical details may be varied without departing from the general principles involved. a

Such a machine is moreover adapted to form part of asystem for producing. rollers in mass, as the rollers after being ground may be passed to a lapping machine, and finally led ,to a measuring machine where they may be graded, these two latter machines being constructed as described in the specifications "of my U. S. Patent No. 1,465,555 and my U. S. application Ser. No. 632 730.

Ilaving now described my invention, what I-claim as new and desire to secure by Letters Patent is 1. A roller grinding machine comprising the combination of a grinding disc, a crown plate facing the disc and parallel thereto, said disc and plate being adapted to rereive between them a series of rollers to be ground arranged on edge, means for causing relative rotatory movement between the disc and plate, and means for imparting also a motion of translation to the crown plate in order to thereby cause the rollers to tilt.

2. A roller grinding machine comprising the combination of a grinding disc, a crown plate facing the disc and parallel thereto, said disc and plate being adapted to re ceive between them a: series of rollers to be ground arranged on edge, said crown plate having its axis of rotation permanently out of alignment with that of the grinding disc, adjustable means whereby the central geometrical axis of the crown plate is adapted to be arranged at different distances from the said axis'of rotation of the crown plate, and means for causing relative rotatory movement between the disc and plate.

3. A roller grinding machine comprising the combinationof a grinding disc. a crown plate facing the disc and parallel thereto, said disc and plate being adapted to receive between them a series of rollers to be ground arranged on edge, means for causing relative rotatory movement between the disc and plate, means for tilting the series of rollers from side to side, and regulating means to adjustably limit the amplitude of such oscillation.

4. A roller grinding machine comprising the combination of a rotary grinding disc, a rotary crown plate facing the disc and parallel thereto, said disc and plate being adapted to receive between them a series of rollers to be ground arranged on edge, an intermediate cage ring for maintainingthe rollers in position, and means for imparting an eccentric translational movement of adjustable amplitude to the crown plate in order to tilt the rollers from side to side.

5. A roller grinding machine comprising the combination of a rotary grinding disc, a crown plate facing the disc and parallel thereto. said disc and plate being adapted to receive between them a series of rollers arranged on edge, a series of seats in the crown pla-te corresponding to the number of rollers and each engaging a roller, means for causing relative rotational movement between the disc and crown plate, means for imparting eccentric translational movement to the crown plate in order to tilt the rollers from side to side and impart thereto a convex periphery, and means whereby the seats for the rollers control the degree of convexity imparted to the periphery of each roller.

6. A roller grinding machine comprising the combination of a rotary grinding disc, a rotary crown plate facing the disc and parallel thereto, a. replaceable annular block on said plate, spring tongues on said plate ateach side of the annular block, said grinding disc and said annular block being adapted to receive between them a series of rollers to be ground arranged on edgeand with their sides in contact with the said spring tongues, a. stationary cage ring intermediate the plate and the disc for maintaining the rollers in position, and means for imparting eccentric translational movement to the crown plate in order to tilt the rollers from side to side and impart thereto a convex periphery.

7. A roller grinding machine comprising the combination of a rotary grinding disc, a rotary spindle, an eccentric pin on said spindle, an adjustable eccentric sleeve upon said pin, and a crown plate engaging upon said eccentric sleeve and arranged so as to face said driving disc and be parallel thereto, said grinding disc and crown plate being adapted to receive between, and in contact with them, a. series of rollers tobe ground arranged on edge.

8. A roller grinding machine as claimed in claim 5, in which spring means are provided for elastically mounting the seats for the rollers within the crown plate.

9. A roller grinding machine comprising the combination of a rotary grinding disc, a rotary spindle, a crown plate mounted upon said spindle, so that its geometrical axis is eccentric with regard to the axis of the spindle, said crown plate being arranged so as to face said driving disc and be parallel thereto, said grinding disc and crown plate being adapted to receive between them a series of rollers arranged on edge, an intermet'liate cage ring for maintaining the rollers in position, and means for applying pressure upon said rotary spindle so as to increase the pressure between the grinding disc and the rollers.

10. A roller grinding machine as claimed in claim 3, in which there is provided intermediate the grinding disc and the crown plate a cage ring with orifices whose sides slope upwardly and outwardly for the purpose of engaging the rollers.

11. A roller grinding machine as claimed in claim 9, in which manually operable means are provided for applying pressure upon the rotary spindle to increase the pressure between the grinding disc and the rollers. I

12. A roller grinding machine as claimed in claim AL, in which the crown plate, whilst being free to impart a tilting movement to the rollers, is prevented from making any substantial movement about its own axis.

In testimony whereof I have signed my name to this specification.

KARL OSKAR LEON. 

